Hiroshi Shinanogawa is a teenager who loves reading mangas about delinquents. He wants to be bad-ass like his favorite comics. In the last summer of his middle school's life, he decides to become a delinquent. He leaves the prestigious private school and "drops out" to start leading a life as a delinquent. Now he is a member of the gang that rules Komae Kita Middle School, hiding the fact that he is an amateur at being a delinquent. He stays and fights together with Iguchi Tatsuya, a leader of a gang and a delinquent who Hiroshi aims to be like.